plat: hikey: update syspll frequency
plat: hikey: update syspll frequency

Change syspll frequency from 1.2GHz to 1.19GHz. It's used to tune
the clock of display system.

Signed-off-by: Haojian Zhuang <979139d45d262f0480136b0da512e0afa0fe79d3@linaro.org>

vchong/arm-trusted-firmware,96boards/arm-trusted-firmware,vchong/arm-trusted-firmware,96boards/arm-trusted-firmware